Effect of Cooperative Learning Strategies on Students' Understanding of Concepts in Electrochemistry

The present study was conducted to investigate the degree of effectiveness of cooperative learning instruction over a traditional approach on 11th grade students' understanding of electrochemistry. The study involved forty-one 11th grade students from two science classes with the same teacher. To determine students' misconceptions concerning electrochemistry, the Electrochemistry Concept Test consisting of 8 open-ended and 12 multiple-choice questions was used as a pre-test and some students were interviewed. According to the results, twenty-four misconceptions (six of them initially identified) about electrochemistry were identified. The classrooms were randomly assigned to a control group (traditional instruction, 21 students) and an experimental group (cooperative learning based on a constructivist approach, 20 students). After instruction, the same test was administered to both groups as a post-test. The results from the t-test indicated that the students who were trained using cooperative learning instruction had significantly higher scores in terms of achievement than those taught by the traditional approach. According to the post-test and interviews, it was also found that instruction for the cooperative group was more successful in remediation of the predetermined misconceptions.     

琼脂糖固定化过氧化氢酶的电化学性能研究

利用琼脂糖（agarose）将过氧化氢酶（Cat）固定在热裂解石墨电极表面,制备Cat—agarose膜修饰电极．包埋在琼脂糖中妁过氧化氢酶与电极直接传递电子,在pH6．0的缓冲溶液中可得一对可逆的氧化还原峰,式电势为-0．343V（vs SCE）,这是过氧化氢酶辅基血红素Fe（Ⅲ）／Fe（Ⅱ）电对的氧化还原．其式电势随溶液的pH值增加而负移且成线性关系,直线斜率为-36．8mV／pH,说明过氧化氢酶的电子传递过程伴随有质子的转移．过氧化氢酶修饰电极．在16．5—278μmol／L的范围内,催化电流与过氧化氢浓度成线性关系．     

烷基咪唑碘的合成及性能实验

为了让化学化工类学生综合利用所学的有机化学、波谱分析以及电化学知识,在大量研究工作的基础上设计了利用高压釜合成离子液体1-甲基-3-己基咪唑碘,并采用超微铂电极测量了I3-在其中的表观扩散系数等实验内容。     

应用电化学实验课初探

应用电化学实验课的选取应尽量考虑电源、电镀、电解等不同电化学过程的显著差别,并能反映电化学领域的科研成果.由学生自己动手组建实验装置,把计算机技术引入到应用电化学实验教学中.     

超微双环银电极的制作及其性能测试

章介绍了通过在玻璃毛细管内外壁化学镀银制作超微双环银电极的方法，并检测了该电极的特性。     

La部分取代Ml混合稀土贮氢合金的电化学性能

金属La部分取代M l(混合稀土)的贮氢合金电极M l0.8La0.2N i4.0Mn0.4Co0.4A l0.1(A)容易活化,其充电效率、放电容量、快速放电能力以及荷电保持能力比电极M lN i4.0Mn0.4Co0.4A l0.1(B)分别提高5.5%、7.0%、4.0%和8.2%。电极A放电过电位比电极增大,且循环稳定性下降。     

电化学合成碘仿装置的改进及反应条件的探索

对电化学合成碘仿装置进行了改进,探索出了利用该装置合成碘仿的最佳反应条件。结果表明,新装置能够满足半微量有机化学实验的要求,碘仿的产率可达到54.9%。该装置具有实用性和推广价值。     

Electrochemical behaviors of lomefloxacin at a single-wall carbon nanotube-modified electrode and its interaction with bovine serum albumin

The electrochemical behaviors of lomefloxacin at a single-wall carbon nanotube-modified glassy carbon electrode have been investigated by cyclic voltammetry. In a Britton-Robinson buffer (pH 4. 5 ), lomefioxacin yields a sensitive and well-defined oxidation peak at ca. 1.24 V (vs. SCE) on the modified electrode. Compared with the bare glassy carbon electrode, the oxidation peak current of lomefloxacin significantly increases and the oxidation peak potential positively shifts. Under the optimal conditions, the interaction of lomefloxacin with bovine serum albumin is also investigated. The results indicate that an electrochemically inactive supramolecular complex is formed and the formation of complex between lomefloxacin and bovine serum albumin is an intercalation mechanism. The proposed methods offer a reference for the studies on the biological effects and action mechanism of lomefioxacin with albumins in vivo.     

电化学沉积制备纳米银粒子的研究

1-乙基-3-甲基咪唑网氟硼酸盐中,在超声波氛围下采用电化学牺牲阳极法直接从金属银制备了球形银纳米粒子．采用X射线衍射（XRD）、透射电子显微镜（TEM）对所制备样品的结构、组成以及形态进行了表征．结果表明．在小实验条件下制得的纳米银粒子杂质含量低,纯度较高,粒度分布集中,颗粒均匀一致,基本呈球形．     

多壁碳纳米管苯胺复合材料的制备及其性能研究

采用共混法制备了多壁碳纳米管苯胺复合材料（MWCNT—ANCTC），通过红外光谱分析了该复合材料的可能反应机理；本文还对该复合材料的荧光性质进行了测定，并对影响其荧光强度的因素及原因进行了讨论．另外发现该复合材料膜能促进电子的转移，对Cu^2＋有特殊的响应，这将使得该复合材料在Cu^2＋的定性定量检测领域有很好的应用前景和价值．